body {
	background: #efefef;
	overflow: hidden;
	width: 100vw;
	height: 100vh;
}
svg {
	display: block;
	width: 100vw;
	height: 100vh; touch-action: none;
	
}
#hint {
	position: fixed;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	font-family: sans-serif;
	font-size: 18px;
	letter-spacing: 0.08em;
	color: #999;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.6s ease;
}
#flash {
	position: fixed;
	inset: 0;
	background: radial-gradient(
		circle at 50%,
		rgba(255, 255, 255, 1),
		rgba(255, 255, 255, 0.6),
		rgba(255, 255, 255, 0)
	);
	opacity: 0;
	pointer-events: none;
}
.cut-line {
	animation: dash-flow 0.3s linear infinite;
}
@keyframes dash-flow {
	to {
		stroke-dashoffset: -10;
	}
}

button {
  font: 13px monospace;
  padding: 6px 10px;
  cursor: pointer;
}
#controls {
  position: fixed;
  top: 12px;
   right: 12px;
  z-index: 10;
}